배열에서 가장 큰 값 얻기

const numArr = [1, 2, 3];
Math.max.apply(null, numArr);

// or

Math.max(...numArr);

참고

• https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/Math/max#%EC%98%88%EC%A0%9C
• https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/Function/apply